Hanna-instruments HI 23 Manual de usuario descargar pdf (Pagina 21)

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• Press  or  to cycle through the data forward or back-

wards respectively.

Note In any moment, by pressing LCD or CAL DATA the meter will

return to the regular operating display.

• Press  or  to view the time of last calibration. The sec-

ondary display will show "HOU".

• Press  or  again to view the cell con-

stant at the time of the last calibration.

The secondary display will show "CEL".

• Press  or  again to return to the first CAL DATA display

(date) at the time of last calibration.

FAULT CONDITIONS AND SELFTEST PROCEDURES

The fault conditions below may be detected by the software:

• EEPROM data error;

• I2C internal bus failure;

• date lost;

• code dead loop.

EEPROM data error can be detected through EEPROM test proce-

dure at startup or when explicitly requested using setup menu.

When an EEPROM error is detected, to the user is given the

option to perform a reset of EEPROM.

Note When an EEPROM reset has been performed

the calibration data are reset to default (every

range). An intermittent CAL will blink on the

display to advise the user of this status.

Note When adjusting values using the  or  keys it is important

to allow for sufficient response time (up to 30 seconds)

The table below lists the values of output codes along with

the calibration point values (which are the analog output

minimum and the analog output maximum) as indicated

on the display.

The secondary display indicates the current calibration point

value, while the primary display indicates the current cali-

bration type.

LAST CALIBRATION DATA

The meter can display the following last calibration data:

• Date

• Time

• Cell constant

While displaying these data, the controller remains in con-

trol mode. The data are related to the selected range only.

The procedure below indicates the flow. Displaying of the

items follows the above sequence.

• To begin the cycle press CAL DATA. The last calibration

date will appear on the primary LCD as DD.MM format,

while the secondary display will show the year.

If the meter has never been calibrated or an EEPROM

reset has occurred, no calibration data are shown when

CAL DATA is pressed. The “no CAL” message will blink

for a few seconds, then the meter skips back to normal

mode.

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